It’s been a historic week on Twitter, as two former U.S. Presidents let their presence be known on Twitter. Bill Clinton joined the ranks of President Barack Obama, all 100 U.S. Senators and 95 percent of the House of Representatives, while the dedication of George W. Bush’s new Bush Center brought us closer to all 5 living presidents via Twitter.

Earlier this week while making an appearance on the “Colbert Report”, Bill Clinton officially joined Twitter as @billclinton. He sent his first Tweet to the show’s host Stephen Colbert (@stephenathome) and his daughter, Chelsea Clinton (@chelseaclinton), both of whom responded.

Also making a splash on Twitter this week was the dedication of the George W. Bush Presidential Library and Museum, and the George W. Bush Institute (@TheBushCenter), the first to open since 2004. Every living president, former world leaders and dignitaries, as well as Bush Administration alumni and other notable guests attended the dedication, many of whom live-tweeted the event using the hashtag #BushCenter.

May be no more patriotic moment in United States than opening of presidential library. Surpasses inauguration, annual holidays #bushcenter— Rick Klein (@rickklein) April 25, 2013

We’re excited to hear more from and about the 42nd and 43rd presidents in 140 characters. Be sure to follow @gov to get the latest updates on the world leaders, politicians and organizations that matter most to you.

Posted by Bridget Coyne (@bcoyne) and Sean Evins (@evins)Government Team

Photos: It’s easier than ever to share photos. Simply click the camera icon in the lower-left corner of the Tweet compose box, and choose a photo to share. If you prefer, you can still drag and drop photos from the desktop.

Retina display support: Now Twitter is even more vibrant and detailed on the highest resolution Mac notebooks. With this update, Tweets will be clearer and sharper, creating a more vivid experience.

On most Mondays, we post “This week on Twitter” to alert you to key things happening in the coming week. Whether it’s a live chat with the cast of your favorite TV show, a Q&A with a political candidate or a pro sports team Tweepstakes, keep current about can’t-miss moments on Twitter in the week ahead. - Ed.Monday, Apr. 22; 8:00 p.m. ET / PT It's a hashtag war! Tune into Love & Hip Hop Atlanta and vote on the characters' actions with hashtag #LHHATL. Follow @LoveHipHopVH1 for the questions and after the show for results.

Countdown: ONE DAY until #LHHATL season 2 premieres at 8/7c on @vh1!!! Who's having a viewing party + are we invited??— Love & Hip Hop (@LoveHipHopVH1) April 21, 2013

Kevin Bacon (@KevinBacon) will host a Twitter Q&A prior to The Following (@TheFollowingFOX) season finale. Fans are invited to tweet Kevin questions on Wednesday using the hashtags #TheFollowingFOX and #AskKevinBacon on Twitter, and he’ll respond on Thursday with a WhoSay video message.

Thursday, Apr. 25; 8:00 a.m. Central TimeFollow @TheBushCenter to experience the real-time opening of The George W. Bush Presidential Center — home to the George W. Bush Presidential Library and Museum and the George W. Bush Institute. In addition to each living President, the First Lady, several campaign surrogates, former staffers, and other noted guests will be in attendance, many of whom will live-tweet using the hashtag #BushCenter.

Thursday, Apr. 25-27; check local listingsCatch live coverage of the #NFLDraft including photos from the red carpet by following @NFL and @NFLNetwork. Stevie Johnson (@StevieJohnson13) and Will Allen (@WillAllenWAF) will be among the current players live-tweeting the event. Vote for your picks on Twitter in real time with the broadcast. Check back next week for more!

Today, we're releasing Twitter #music, a new service that will change the way people find music, based on Twitter. It uses Twitter activity, including Tweets and engagement, to detect and surface the most popular tracks and emerging artists. It also brings artists’ music-related Twitter activity front and center: go to their profiles to see which music artists they follow and listen to songs by those artists. And, of course, you can tweet songs right from the app.

The songs on Twitter #music currently come from three sources: iTunes, Spotify or Rdio. By default, you will hear previews from iTunes when exploring music in the app. Subscribers to Rdio and Spotify can log in to their accounts to enjoy full tracks that are available in those respective catalogs. We will continue to explore and add other music service providers.

So, if you’re interested in the songs that have been tweeted by the artists and people you follow on Twitter, you can navigate to #NowPlaying to view and listen to those songs.

Or if you’re scrolling through a chart and you want to learn more about a band, like Chvrches, you can tap their avatar to see their top song, follow them right from the chart, or tap their Twitter username to go to their profile.

Or if you want to listen to music from the artists Wiz Khalifa follows, you can search for his name using the search icon in the top right corner. Then tap one of the artists you’re interested in and hit the play button to begin listening, or press play on the player to listen to all the artists.

And as you discover new songs that you want to share with your followers on Twitter, simply tap the spinning disc in the lower left corner. This opens the player, and you can tweet from there using the Tweet icon in the top right corner.

You can download Twitter #music from the App Store today, or enjoy the web version, which will be rolling out over the next few hours: music.twitter.com. Right now, the service is available in the US, Canada, the UK, Ireland, Australia and New Zealand. Over time, we will bring the service to Android as well as to more countries.

Twitter and music go great together. People share and discover new songs and albums every day. Many of the most-followed accounts on Twitter are musicians, and half of all users follow at least one musician. This is why artists turn to Twitter first to connect with their fans — and why we wanted to find a way to surface songs people are tweeting about. We offered music artists an early look at the service. You can see some of their reactions below. We hope you like it, too.

playing with @twitter's new music app (yes it's real!)...there's a serious dance party happening at idol right now— Ryan Seacrest (@RyanSeacrest) April 11, 2013

Man this new Twitter music app is insane!— Wiz Khalifa (@wizkhalifa) April 13, 2013

On most Mondays, we post “This week on Twitter” to alert you to key things happening in the coming week. Whether it’s a live chat with the cast of your favorite TV show, a Q&A with a political candidate or a pro sports team Tweepstakes, keep current about can’t-miss moments on Twitter in the week ahead. - Ed.

Saturday, Apr. 20; 12:00 p.m. ET / 9 a.m. PT Comedy legends Cheech and Chong (@CheechandChong) will host a Twitter Q&A in celebration of their new animated feature-length film, “Cheech and Chong’s Animated Movie”. Fans can follow the conversation or participate by using the hashtag #CC420.

For this year’s MTV Movie Awards, the judges are stepping aside and letting the viewers’ voice be heard: fans can now cast their vote via a Tweet. As movie buffs tune-in, they can also tweet-in as they vote, comment on their favorite acceptance speeches, share their picks for best dressed, or join the conversation as their favorite actors live-tweet the show. Viewers can check out the MTV Movie Awards Discover page, for specially-curated content live, leading up to and during the show.

#BestHero AwardFans can use the following hashtags to cast their vote:#VoteBilbo - The Hobbit#VoteBatman - The Dark Knight Rises#VoteCatwoman - The Dark Knight Rises#VoteHulk - The Incredible Hulk 2#VoteIronMan - Iron Man 3#VoteSnowWhite - Snow White and the Huntsman

The “Giffies” Viewers should follow @MTV to keep up-to-date on the first-ever real-time awards show about the awards show. @MTV has teamed up up with @VH1 to offer a unique perspective, creating gif categories based on the show that will be tweeted-out in real-time. Fans can keep an eye out for “giffie” categories like “Best smirk," “Best long drawn-out acceptance speech,” and more.

Live-tweeting cast Whether they’re at the show or on their couch at home, stars will be putting in their two cents on Twitter, live during the show. Fans can follow these VIPs to get an insider’s look:

Today, we’re introducing Trends in more than 160 new locations. Included in that list are a number of countries that will be getting Trends for the first time: Belgium, Greece, Kenya, Norway, Poland, Portugal, and Ukraine, plus more than 130 new cities in countries that already have Trends.

Trends are an easy way to find out what people are talking about right now –– around the world, in your country, or in your city. By checking out Trends, you can easily find breaking news and current hot topics that are most relevant to you. To find these new locations, click “Change” in the Trends sidebar on twitter.com, and select the city or country you’re most interested in.

To make Trends more convenient and relevant for people around the world, we’re constantly working to bring Trends to more locations –– be on the lookout for even more in the future. In the meantime, don’t hesitate to check out our support article on Trends for more information.

Day in and day out, tuning in with Twitter makes watching TV all the more enjoyable. You can talk to the stars of your favorite scripted shows, see behind-the-scenes peeks of what happens on talk show sets, or receive exclusive color commentary about a big game. Bridging its primetime, daytime, and sports programming, CBS is kicking of #CBSTweetWeek today, offering viewers an exclusive weeklong tweetstravaganza.

Between April 4-10, the network’s stars and talent will be live-tweeting programs ranging from March Madness to The Price is Right to NCIS. All in all, 47 stars will hold Twitter chats for 19 programs throughout the week. For a full schedule of live-tweeting lineups, visit http://www.cbs.com/TweetWeek.

We just released a new version of Twitter for Android. Its new design reflects a native Android experience: wider and taller timelines that fill the screen, a flat navigation bar, tap and hold for quick actions, and more. You can now quickly navigate between tabs by swiping across your screen. And as you type your Tweet or search, you’ll see username and hashtag suggestions, making it easier to connect with friends and join conversations.

In addition to the Android app, we’ve also updated Twitter for iPhone and mobile.twitter.com. All three mobile apps, plus twitter.com, now show more types of content in expanded Tweets: photo galleries, apps and product listings.

You’ll also see a new link right below content that is shared from another mobile app, such as Foursquare or Path.

The link lets you open or download the app right from the Tweet, depending on whether or not you have it installed. As an example, if you expand a Tweet to view a photo from Flickr, you can tap the link to open the photo in Flickr. If you don’t yet have the Flickr app on your phone, you can tap to install it from the Tweet.

These updates, which are rolling out to users over the next several days, are part of our ongoing effort to make it easier for you to connect with interesting and relevant content on Twitter. If you’re interested in the under-the-hood details, there are more on our Developer blog.

Our second Hack Week of the year has just begun. (Yes, it is April Fools Day; no this is not a joke.) This is one of my favorite parts of each quarter –– as a company, we take a full week to work with people from other teams, explore new ideas, experiment with different projects and let our creativity run wild.

Some projects are hobby projects, and they may inspire new ideas or cause teams to think about a core feature in a new way. Other projects ship –– awesome and unique products have come out of Hack Week. Have you downloaded your Twitter archive yet? That was a Hack Week project. Or have you seen the Tweets from @twisitor, a birdhouse you can tweet from when you visit Twitter HQ? That was one of last quarter’s Hack Week projects.